package com.hsmpay.common.util;

import java.io.UnsupportedEncodingException;
import java.net.URLDecoder;
import java.net.URLEncoder;

/**
 * 公司：中亿支付科技发展有限公司
 * 项目名称:中亿支付
 * 建立人：颜铃璋
 * 建立时间：2012-12-27
 * 版本：第一版
 * 功能：URLDecoderTools 主要是url转码
 */
public class URLDecoderTools {
    public static String decodeUTF8(String str) {
        /*StringBuffer tempBuffer = new StringBuffer();
	     int incrementor = 0;
	     int dataLength = str.length();
	     while (incrementor < dataLength) {
	        char charecterAt = str.charAt(incrementor);
	        if (charecterAt == '%') {
	           tempBuffer.append("<percentage>");
	        } else if (charecterAt == '+') {
	           tempBuffer.append("<plus>");
	        } else {
	           tempBuffer.append(charecterAt);
	        }
	        incrementor++;
	     }
	     str = tempBuffer.toString();
	     str = URLDecoder.decode(str, "utf-8");
	     str = str.replaceAll("<percentage>", "%");
	     str = str.replaceAll("<plus>", "+");*/
        if (null == str) {
            return null;
        }
        String result = str;
        try {
            result = URLDecoder.decode(str, "utf-8");
        } catch (IllegalArgumentException e) {
            result = str;
            //log.debug("result########################"+result);
        } catch (UnsupportedEncodingException e) {
            result = str;
            //log.debug("result########################"+result);
        }
        return result;
    }

    public static String encodeUTF8(String str) {
        if (null == str) {
            return null;
        }
        String result = str;
        try {
            result = URLEncoder.encode(str, "utf-8");
        } catch (IllegalArgumentException e) {
            result = str;
            //log.debug("result########################"+result);
        } catch (UnsupportedEncodingException e) {
            result = str;
            //log.debug("result########################"+result);
        }
        return result;
    }

    public static String getRemoteHost(javax.servlet.http.HttpServletRequest request) {
        String ip = request.getHeader("x-forwarded-for");
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getHeader("Proxy-Client-IP");
        }
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getHeader("WL-Proxy-Client-IP");
        }
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getRemoteAddr();
        }
        return ip.equals("0:0:0:0:0:0:0:1") ? "127.0.0.1" : ip;
    }

    /**
     * unicode解码
     * @param theString
     * @return
     */
    public static String decodeUnicode(String theString) {
        char aChar;
        int len = theString.length();
        StringBuffer outBuffer = new StringBuffer(len);
        for (int x = 0; x < len;) {
            aChar = theString.charAt(x++);
            if (aChar == '\\') {
                aChar = theString.charAt(x++);

                if (aChar == 'u') {
                    int value = 0;
                    for (int i = 0; i < 4; i++) {
                        aChar = theString.charAt(x++);
                        switch (aChar) {
                            case '0':
                            case '1':
                            case '2':
                            case '3':
                            case '4':
                            case '5':
                            case '6':
                            case '7':
                            case '8':
                            case '9':
                                value = (value << 4) + aChar - '0';
                                break;
                            case 'a':
                            case 'b':
                            case 'c':
                            case 'd':
                            case 'e':
                            case 'f':
                                value = (value << 4) + 10 + aChar - 'a';
                                break;
                            case 'A':
                            case 'B':
                            case 'C':
                            case 'D':
                            case 'E':
                            case 'F':
                                value = (value << 4) + 10 + aChar - 'A';
                                break;
                            default:
                                throw new IllegalArgumentException(
                                        "Malformed   \\uxxxx   encoding.");
                        }
                    }
                    outBuffer.append((char) value);
                } else {
                    if (aChar == 't')
                        aChar = '\t';
                    else if (aChar == 'r')
                        aChar = '\r';
                    else if (aChar == 'n')
                        aChar = '\n';
                    else if (aChar == 'f')
                        aChar = '\f';
                    outBuffer.append(aChar);
                }
            } else
                outBuffer.append(aChar);
        }
        return outBuffer.toString();
    }

}
